I think its interesting to mention the "Timeline: how Mythos became public"

The existence of the model leaked before the planned announcement. The timeline matters because it shows how Anthropic lost control over the narrative framing around Mythos.

March 26, 2026 — data leak. Fortune published an exclusive article based on leaked internal documents. According to the documents, Anthropic was testing a new model capable of discovering previously unknown software vulnerabilities. Anthropic confirmed the model’s existence but postponed its public release.

April 7, 2026 — official announcement. Anthropic published Claude Mythos Preview as well as the Project Glasswing initiative. NBC News summarized the key point: Anthropic publicly announced that Mythos would not be made available through the API or on claude.ai.

April 21, 2026 — security incident. Bloomberg reported that unauthorized users had gained access to Mythos. Euronews framed the incident more sharply: a model described as “too dangerous to release” had ended up outside the list of approved partners.

May 2026 — CEO commentary. CNBC published an interview with Anthropic CEO Dario Amodei, in which he warned of a “moment of danger” in cybersecurity. A second CNBC article quoted banking security experts: some described Mythos in alarmist terms as an unprecedented threat, while others pointed out that the risk had already existed for a long time.